东南沿海地区春季典型臭氧污染过程模拟研究

Simulation Study on Typical Ozone Pollution Process in the Southeast Coast of China in Spring

文章应用WRF-CHEM模式模拟分析了东南沿海地区2017年4月28日-5月1日的天气变化过程以及大气污染过程,并以东南沿海地区福建省泉州市为研究区域定量分析了春季外来输送对泉州市臭氧浓度贡献。模式准确地模拟了泉州大气臭氧的时间变化趋势以及我国东部以及东南沿海地区的臭氧空间分布状况,较好地再现了天气形势以及大气臭氧污染的演变过程。在春季研究时段内,来自华北及长江三角洲长距离输送的污染物与本地排放相互作用,在局地海陆风作用下造成东南沿海地区的臭氧污染。定量研究结果表明在东南沿海地区发生高臭氧污染时,外来输送对泉州市区臭氧污染贡献约占38%。

WRF-CHEM model is used to simulate weather changes and atmospheric pollution process of the southeast coastal region of China,and quantitatively analyze trans-boundary transport of ozone pollution in Quanzhou during the spring episode from April 28 to May 1,2017.The WRF-CHEM model performs well in simulating the temporal variation of O3 concentrations in Quanzhou against observations.Moreover,the model also successfully reproduces the spatial distribution of O3 concentrations in eastern and southeast coastal region of China.The WRF-CHEM model also perfectly simulates the transition of weather situation and atmospheric ozone pollution.During the springtime in 2017,the pollutants in Yangtze River and North China Plain are delivered to the coastal region of China,and interacted with the local emissions under the influence of sea-land breeze,causing the ozone pollution in the southeast coastal region of China.The quantitative results indicate that external source transport contributes approximately 38%to the afternoon O3 concentration in Quanzhou when the severe ozone pollution occurs.